arctan100-arctan0.1+arctan10
    90-arctan100-arctan0.1+arctan10
    （8/2）/（21.2%×100）×14.35%×100×2.18
    8/2/21.02%*14.35%*2.18
    8/2/21.02*14.35*2.18
    8/0.4/8%*9%*0.3
    8/0.4/8%*100*9%*100*0.3
    （21.2%+17.5%+24.3%）/3
    （8/2+8.1/3+11/2.2）/3
    （8/2+8.1/3+11/2.2）/3/（21.2%+17.5%+24.3%）/3
    90-arctan6.32-arctan(0.008*63.2)+arctan(0.03*63.2)
    90-arctan6.32-arctan0.008*63.2+arctan0.03*63.2
    [(223+608)*(1+0.18+0.466+0.2+0.2+0.24)+311]*(445.1%*5+70%*12.5)*(0.2+0.8*（2.5+0.662）)*（1+0.583+0.4）*0.8*0.5
    [(223+454)*(1+0.18+0.466+0.2+0.24)+311]*(445.1%*5+70%*12.5)*(0.2+0.8*2.5)*（1+0.583+0.69）*0.8*0.5 =
    [(223+510)*(1+0.18+0.466+0.413+0.2+0.24)+311]*(445.1%*4+70%*10)*(0.2+0.8*2.5)*（1+0.583+0.8）*0.8*0.5
    10lg4
    0+π
    90-arctan(2.3/5)-arctan0.23
    [35169.16*5.4172-60000]/5.4172
    7.5%*75%*2/5+10.94%*3/5

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